Yes, you can refuse a field sobriety test in California. The roadside coordination exercises an officer asks you to perform during a DUI stop are voluntary, and no statute imposes an automatic fine, suspension, or criminal penalty for declining them. The important caveat: refusal does not end the investigation. The officer can still arrest you based on everything else observed during the stop, and a prosecutor can mention the refusal at trial. A separate rule governs the chemical breath or blood test given after a lawful arrest, and refusing that one carries serious consequences you should not confuse with the roadside tests.
Why the Roadside Tests Are Optional
California’s implied consent law, Vehicle Code Section 23612, requires you to submit to chemical testing of your blood or breath after a lawful DUI arrest. It does not reach the physical coordination exercises officers conduct on the shoulder of the road before any arrest.1California Legislative Information. California Vehicle Code 23612 Those pre-arrest tests, including the walk-and-turn, the one-leg stand, and the eye-tracking exam, sit in a legal gap: officers may ask, but you face no license suspension, fine, or criminal enhancement for saying no.
Most drivers do not realize this because the officer rarely explains it. The request often sounds like an instruction (“Step out and perform some tests for me”), which makes compliance feel mandatory. It isn’t. A calm, polite refusal is within your rights.
What Happens If You Refuse
Declining the field sobriety tests does not make the DUI investigation go away. Expect three things.
First, the officer keeps observing you. Everything from the moment the stop begins is potential evidence: how you pulled over, whether you fumbled with your license, the smell of alcohol on your breath, bloodshot eyes, slurred speech. Officers document all of it regardless of whether you perform the tests. Refusing simply means the officer has fewer data points, not zero.
Second, the officer can still arrest you. Probable cause for a DUI arrest does not require field sobriety test results. Erratic driving, the odor of alcohol, and your general demeanor can be enough on their own, and many DUI arrests happen without any roadside performance at all.
Third, your refusal can come up in court. California prosecutors can argue that you declined because you knew you were impaired, a “consciousness of guilt” theory. It does not prove anything by itself, but it gives the prosecution a talking point in front of a jury. A defense attorney can counter that plenty of sober people refuse on principle or on advice of counsel, and you should know the argument exists before making the choice.
The Roadside Breath Test: Different Rules for Some Drivers
Separate from the physical exercises, officers often carry a handheld Preliminary Alcohol Screening (PAS) device. For most drivers over 21 who are not on DUI probation, the pre-arrest PAS test is also voluntary and can be declined like any other field sobriety test. It is a screening tool, not the evidentiary chemical test that implied consent law covers.
Two groups cannot refuse the PAS without consequences:
- Drivers under 21. California’s zero-tolerance law requires submission to a PAS test when an officer has reasonable cause to believe an underage driver has any measurable alcohol in their system. Refusing triggers a one-year license suspension.
- Drivers on DUI probation. Vehicle Code Section 23154 deems that a driver on DUI probation has already consented to a PAS test when lawfully detained for a suspected alcohol-related violation. Refusing carries its own suspension.2California Legislative Information. California Vehicle Code 23154
If you are over 21 with no DUI probation history, you can decline both the physical coordination tests and the PAS breath device before arrest without triggering an automatic penalty.
The Post-Arrest Chemical Test Is Not Optional
This is the single most important distinction in a DUI stop, and getting it wrong is expensive. Once you are lawfully arrested for DUI, implied consent kicks in and you are required to submit to a chemical test of your blood or breath.1California Legislative Information. California Vehicle Code 23612 This is not the handheld roadside PAS. It is the evidentiary test, typically administered at the station or by a phlebotomist.
Refusing the post-arrest chemical test triggers escalating DMV penalties:
- First refusal: one-year license suspension.
- Second refusal within 10 years: two-year license revocation.
- Third refusal within 10 years: three-year license revocation.
These are administrative actions and happen independently of what the criminal court does with the DUI charge. You can lose your license even if the DUI itself is later dismissed. On top of the suspension, if you are convicted of DUI after refusing the chemical test, Vehicle Code Section 23577 adds enhanced criminal penalties, including mandatory additional jail time that the judge cannot waive or stay.3California Legislative Information. California Vehicle Code 23577
Decline the roadside exercises if you choose. Comply with the chemical test after a lawful arrest.
How to Decline Without Making Things Worse
Pull over promptly, turn off your engine, and keep your hands visible. When the officer approaches, hand over your license, registration, and proof of insurance. You are required to identify yourself during a traffic stop.4ACLU of Northern California. Know Your Rights: Police Interactions
Beyond identifying yourself, you have the right to remain silent. You do not have to answer questions about where you were, how much you drank, or when your last drink was. Politely invoke that right instead of trying to talk your way out of the stop. Anything you say becomes evidence, and “I only had two beers” has started more DUI convictions than most people realize.
If the officer asks you to perform coordination exercises or a roadside breath test, you can decline with something like: “I respectfully decline to take any field sobriety tests.” Stay polite. Do not argue, do not explain your reasoning, and do not lecture the officer about your rights. The less you say, the less material the prosecution has.
If you are arrested, the calculation flips. Submit to the chemical breath or blood test. Then contact a DUI attorney as soon as possible. You have only 10 days from the date of arrest to request a DMV administrative hearing to challenge the license suspension, and missing that deadline means the suspension takes effect automatically.
Commercial Drivers Face Additional Risks
If you hold a commercial driver’s license, the stakes are higher. Federal regulations through the FMCSA Drug and Alcohol Clearinghouse treat a refusal to submit to a required alcohol test as a violation that goes on your record and prohibits you from operating a commercial vehicle.5Federal Motor Carrier Safety Administration. Drug and Alcohol Clearinghouse FAQ State licensing agencies must downgrade your commercial privileges until you complete a return-to-duty process involving a substance abuse professional evaluation and follow-up testing. The violation stays in the Clearinghouse for five years or until that process is complete, whichever is later. For a driver whose income depends on a CDL, a single refusal can mean months without work.